Telephone transmitter



Oct. 26, 1926. T 1,604,227

J. s. JONES ET AL TELEPHONE TRANSMITTER Filed Nov. 24, 1925 I N V EN TOR. JZJEP/I J. Jbr/ss. Jana/EL A! M 00, J1

M 1 ATTORNT g Patented ct. lgfid.

JOSEPH S. JONES, QF BROOKLYN, AND SAMUEL N. MEAD, JR., OF BALDWIN, NEW YORK,

ASSIGNORS TO CHAS. CORY 85 SON, INCL, OF NEW YORK, N. Y., A CORPORATION'OF NEW YORK.

TELEBHONE r'nansivrrrrnn.

Application filed November 24, 1925. Serial No. 71,032.

Our invention relates to improvements in telephone transmitters, and more particularly to the group of parts constituting variable contact mechanism of the carbon type.

The general object is to provide carboncontact mechanism in which the chamber is especially shaped and adapted to maintain the comminuted carbon or graphite which constitutes the variable conducting medium in a uniform normal arrangement and state of compactness, in co-operation with a button especially conformed to co-operate with the chamber in properly maintaining the graphite particles in such uniform state of compactness and arrangement, regardless of the position of the transmitter in which the contact mechanism is employed.

Another object is to improve details of construction of such contact devices in various ways, sufiiciently explained hereafter.

The accompanying drawing shows one-exemplifying embodiment of the invention. After considering this example, skilled persons will understand that many variations may be made without departing from the principles of the invention, and we contemplate the employment of any structures that are properly within the scope of the appended claims.

Fig. 1 is a view in side elevation of a telephone transmitter with the casing and other parts broken away or sectioned to show the contact mechanism, which is represented mainly in longitudinal section.

Fig. 2 is a front elevation of the contact mechanism with some parts broken away.

Fig. 3 is an enlarged, part-sectional-detail of the button. and related parts.

In Fig. 1, 1. is the casing of any known or suitable telephone transmitter having any suitable diaphragm (not shown) properly supported within the front portion 2. Within the casing is any suitable framework 3 having an aperture at at to receive a metal contact base or support 5 which constitutes one of the terminals, as indicated by a conductor 6 soldered or otherwise suitably s'ecured thereto. A cup 7 of insulating material, such for example as hard rubber or a synthetic-resin composition, is secured to the terminal or base 5 by a screw 8 having a thin, flat, wide circular head 9 lying against the inner bottom of the cup. A thin circular carbon disk 10 is located in close of the cup forming the periphery of the counterbore are provided with small lugs 12 engaging notches in the disk to aid in its retention. Outward from the counterbore and the outer surface of the carbon disk,

the cup is shaped to provide a chamber 13 of generally shallowcylindrical contour, but

with a substantial curve or filet 14 at the bottom of the cylindrical wall, so that the general form of the chamber, as well defined by a longitudinal section-plane, as shown in Fig. 1, is that of a shallow cup. The outerface of the chamber is closed by a flexible disk of mica or other suitable insulating material, clamped against the outer face of the cup wall by a flanged ring nut or bezel 21. The mica disk is clamped to the button structure, as best shown in Fig. 3, including the button proper. 25, which has an inward, shallow conical face or head 26. The'outward portion of the head consists of a shallow cylindrical member 27 having an external screw thread to receive a locking flange 28 provided with spanner sockets 29. lhe locking flange clamps the mica :disk 20 against the outward face of the button head surrounding the threaded member 27. at. small screwthreaded stem 30 extends outward from the center of .the button portion 27 and engages in a suitable threaded bore of a rod or con nector 31, Fig. 1, which is in turn connected to the diaphragm to vibrate the button structures. i

The chamber defined by the interior formation of the cup, as above described, the flexible disk 20 and the inner conical face 26 of the button, is substantially filled with comminuted carbon 35. v

lhe button'or its outer locking flange 28 constitutes the other terminal of the contact mechanism and a conductor 40 is secured thereto by soldering or otherwise.

lhe carbon chamber as will now be understood, is not only in the form of a shallow cup, but its outward portion, defined by the inner face of the button, is in the form of a shallow conical concavity. This chamber formation in cooperation with the button serves to retain a relatively small mass of carbon particles in substantially iii) uniform arrangement and compactness between the button and the carbon disk, and so to maintain to a high degree the uniform action of the comminuted carbon in varying the current flow in response to diaphragm movements, in whatever position the trans mitter may be placed. This is especially important and useful when the transmitter is more or less portable and may be tilted at almost any'angle, as for instance when it is,

incorporated in telephone equipment designed for attachment to the body of an operator.

In addition to the form of the chamber serving to properly maintain the comminuted carbon mass in uniform arrangement or compactness, the shallow conical form of the button provides an advantageous and effective movable contact for accurately conveying to the dompressible carbon mass the varying pressure efiects derived from diap-hragm movements.

lVe claim:

1. Telephone transmitter contact mechaiism comprising a cup, a shallow conical but ton therein, and a flexible disk connecting the button and the cup, the parts named forming a shallow and flat-bottomed cupped chamber with a concave shallow conical outer face, the chamber being approiiimately filled with comminuted carbon.

2. Telephone transmitter contact mecha-' disk and adjacent cup walls defining the inner contour of a shallow cup-formed chamber having a flat bottom and with curved contours adjacent the periphery of the disk, a shallow conical button defining the principal part of the outward portion of the chamber, and a flexible disk securing the button to the cup.

4. Telephone transmitter contact mechanism comprising a cup of insulating material having a central counterbore, a thin carbon disk secured in the counterbore, the disk and adjacent cup walls defining the inner contour of a shallow cup-formed chamber having a flat 'bottom and with curved contours adjacent the periphery of the disk, a shallow conical button defining the principal part of the outward portion of the chamber, and a flexible disk securing the button to the cup, the chamber so defined bein ap roximately filled with comminute car on which is maintained in a uniform arrangement and normal compression by the stated chamber'formation, irrespective of tilting of a transmitter in which the mechanism is incorporated.

5. Transmitter contact mechanism comprising a cup of insulating material, a contact-base therefor, a screw passing throughthe cup bottom engaging a threaded .bore in the base, the screw having a thin flat head located in the bottom of a counterbore at the inside of the cup bottom, a thin carbon disk secured in the counterbore against the screw head, the wall of the cup outward from the disk defining a shallow cup having a flat bottom and with substantial curvature adjacent the periphery of the carbon disk, and a button flexibly secured to the cup and forming the outward portion of a carbon chamber.

Signed at New York city, in the county of New York and State of New York this 18th day of Novbr. A. D. 1925.

JOSEPH S. JONES. SAMUEL N. MEAD, JR. 

